libretranslate-rs

A LibreTranslate API client for Rust.

libretranslate = "0.2.9"

libretranslate allows you to use open source machine translation in your projects through an easy to use API that connects to the official webpage.

Basic Example

libretranslate is an async library, so you'll have to use an async runtime like tokio or async-std.

All translations are done through the translate function:

use libretranslate::{translate, Language};

#[tokio::main]
async fn main() {
    let source = Language::French;
    let target = Language::English;
    let input = "Le texte français.";

    let data = translate(Some(source), target, input).await.unwrap();

    println!("Input {}: {}", data.source.as_pretty(), data.input);
    println!("Output {}: {}", data.target.as_pretty(), data.output);
}

Output:

Input French: le texte français.
Output English: the French text.

See In Examples Folder

Language Detection

libretranslate uses whatlang to detect language so you can translate unknown languages into a target language of your choice.

whatlang isn't perfect though, and for short sentences it can be very bad at detecting language. whatlang can detect more languages than libretranslate can translate, so if it detects your input as a language that libretranslate can't translate, the translate function will return a TranslateError::DetectError.

Here's a simple example.

use libretranslate::{translate, Language};

#[tokio::main]
async fn main() {
    let target = Language::English;
    let text = "le texte français.";

    let data = translate(None, target, text).await.unwrap();

    println!("Input {}: {}", data.source.as_pretty(), data.input);
    println!("Output {}: {}", data.target.as_pretty(), data.output);
}

Output:

Input French: le texte français.
Output English: the French text.

See In Examples Folder

Language Functionality

The Language enum has a lot of functionality so you can create a Language from all sorts of different user inputs.

You can return a &str with the language's name in English using as_pretty(), or the language's code using as_code().

Language also implements FromStr so you can create a Language using text like "en", or "English" (case doesn't matter). You can do this by either using Language::from() or .parse::<Language>().

Here's a simple example.

use libretranslate::Language;

fn main() {
    let lang = Language::English;
    let lang_parse = "english".parse::<Language>().unwrap();

    assert_eq!(lang, lang_parse);
    assert_eq!("en", lang.as_code());
    assert_eq!("English", lang.as_pretty());
}

See In Examples Folder

String Methods

The trait Translate implements AsRef<str>, meaning that any &str or String can be translated into any other language.

Here's a simple example.

use libretranslate::{Language, Translate};

#[tokio::main]
async fn main() {
    let text = "This is text, written on a computer, in English."
        .to_lang(Language::German)
        .from_lang(Language::English)
        .translate()
        .await
        .unwrap();

    println!("Output: \"{}\"", text);
}

Output:

Output: "Dies ist Text, geschrieben auf einem Computer, in Englisch."

See In Examples Folder

Available Languages

• English
• Arabic
• Chinese
• French
• German
• Italian
• Japanese
• Portuguese
• Russian
• Spanish

Written in Rust, with love by Grant Handy.